Over the past few years, Earth Day has picked up a lot of steam at MIT. In fact, this year the Institute set aside four days for sustainability-related exhibitions, fairs, and a film screening. Visit the Sustainability @ MIT Web site for details and a full schedule.

And if it’s been awhile since you calculated your ecological footprint, check out Earth Day Network’s sleek new calculator. Choose an avatar, and then answer a series of questions to find out how many planets it takes to support your lifestyle. Once you’ve got the number, record it in the poll below.